It's 5 days            we came here. Why shouldn't we start?
A．whenB．beforeC．a(chǎn)sD．since
D

試題分析：句意：從我們到這里來(lái)已經(jīng)五天了。為什么我們不出發(fā)呢？ A. When當(dāng)...時(shí)候B. before 在...之
前 C. As如同，因?yàn)镈. Since因?yàn)椋詮�。故選D。
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